If he isn't killed until you encounter Rom, the Vacuous Spider, he will disappear. Instead, you can find a dead body with yellow garments where he was standing, which is believed to be Henryk's corpse.

It's unknown if that corpse truly is Henryk, but either way Henryk will no longer appear and fight you.

The disappearance from Tomb of Oedon can happen even before the encounter with Rom. The trigger is either entering Forbidden Woods or defeating the boss of the Forbidden Woods.

Strategy (vs.)

In NG, Henryk is encountered at a point where he is incredibly tough (but not impossible) to kill alone. However, the Hunter has a few things that will help him/her with this fight to make things a bit more fair.

The Hunter can carefully sneak up to him by dropping from the ledge where you normally find the Red Jeweled Brooch and get a free visceral attack.

After a short while, Eileen will appear and help you kill Henryk.

She does a lot of damage, but it's possible for her to be killed, therefore it's suggested that you help her by attacking Henryk to ease some of the pressure.

Be careful not to hurt Eileen since your attacks can damage her as well. She can turn hostile if you damage her too much.

Do not, under any circumstances, allow Eileen to be stunlocked; Henryk can deal a lot of damage in a short period of time.

Ok so I just managed to do this first try, amazingly. After reading all this, I was pretty sure I was gonna get my***** pushed in and fail and Eileen would be dead and everything. So I tried visceraling him + a charged attack from transformed weapon. It worked but did like no damage, so I was panicking at that point. Then Eileen comes in and at first she didn't do anything, I used the Gascoigne strategy with the tombstones which was working well, I got him down to probabbly 1/2 health. Then he realized that this was now 2v1 instead of 1v1 and goes after Eileen and I used poison knives and my pistol as covering fire while Eileen laid into him and I had to kite him around a bit but he went down before I knew it. Overall, it was heart-pounding but not as difficult as I thought it would be after reading all this.

Now I am having lore-related questions. If Henryk can be summoned, even after being KILLED, what does that mean exactly? Did he "wake up" to some other time or place in yharnam? Did Gascoigne and his family "wake up" too? I doubt he or Gascoigne (and family) were dreamers so... Why can we summon him once we kill him? To me it seems like that anyone who dies in this nightmare "wakes up."

To get to Henryk in Oedon’s tomb, simply warp to Cathedral Ward and go back down the stairs. The place where the dweller sits, go through the door and down. If you slowly descend the stairs towards the place where you fought Gascoigne he won’t notice you. You can slowly approach him, he won’t notice you until you’re close enough to lock on him. He’ll then do a roar gesture and either sprint towards you or shoot his gun. If you’re quick and your weapon at least a +3 you can give him plenty of damage. He is quicker than Gascoigne but his weapon has less range. Using an extended version of the Saw Cleaver helps keep your distance while attacking him. About 10-20 seconds into the fight, Eileen will rush out to help. She can distract him while you sneak up behind. Using a charged R2 attack can help take a lot of his health. Be careful of harming Eileen, she doesn’t become hostile unless you hit her more than 3 times. I don’t know if she can take more hits without becoming hostile, I accidentaly hit her 3 times and she was okay. I didn’t try this but its possible that its less likely you’ll hit her if you use an unextended weapon once she comes in to help. During the fight try to get Henryk’s attention so Eileen can heal up. Beware the visceral attack, he spams that shit. Eileen can take one visceral attack without dying, but she’ll loose a big chunk of health, so make sure to attack Henryk and distract him if she fell victim to the attack (so she can heal). You could also use the opportunity to back stab him, as soon as his attack ends. It may take some tricky timing though. Its not a very difficult fight if you’ve already fought the hunter NPC in Old Yarnham - their movements follow a similar pattern.

For the record, I just want to restate loudly for any new players who missed it: HENRYK WILL DISAPPEAR FROM THE TOMB OF OEDON WHEN YOU ENTER THE FORBIDDEN WOODS AFTER DEFEATING VICAR AMELIA. This will make it impossible to get his gear set (best Bolt defense) and to complete Eileen the Crow's questline, eliminating the Crow Set and Blades of Mercy from your game. This really, really sucks. Feels like I wasted this whole playthough now.

This guide fed me misinformation. It says he's at the bottom of Oedon tomb, which doesn't make sense. So I went to Oedon Tomb, only to find that's the place it was referring to. As a result, I wasn't prepared to fight Henryk and Eileen ended up dying.

To beat him at the tomb, get him on the opposite side of a group of tombstones. You can hit him with a melee weapon through the graves, and it is easy to step back without getting hit by his melee attacks. Further more, his gunshots are unable to pass through the graves

If you enter the Tomb of Oedon from Oedon Chapel, you can jump down to the roof where you find Viola, then down again to get behind Henryk. Move carefully around the tree and tombstones behind him and you can get a free visceral attack. Follow with a charge attack, hitlock him, and he should be down to about 1/4 health. Makes it way easier to keep Eileen alive, since she won't appear until a few seconds after he's been aggro'd.

I didn't visit the Tomb of Oedon to encounter Henryk and am in the Forbidden Woods but have NOT yet defeated (or encountered) the Shadows of Yharnam. Henryk has de-spawned and Eileen is nowhere to be found. I presume the trigger for Henryk de-spawning is either entering the Forbidden Woods or reaching some point within it, but not encountering or beating the boss (and definitely not defeating Rom). I'm in NG+2.

If he starts wrecking Eileen, just start blasting at him with a pistol to draw his attention away. Both you and Henryk become stronger on higher NG's, but for this fight, Eileen remains about as powerful as a squeaky toy. If you're really having trouble, you can probably goad him around the arena until he does his "Roar" gesture, which offers you a big chunk of time to start a combo chain or use a charge attack. Not sure if he does it more than once, though.

Love this NPC. Hes probably the strongest NPC summon in the game and I find him badass since he uses the same weapons I use in the game. Plus on NG+ he made those bosses incredibly easy which us awesome since on NG I had so much trouble with Rom. Hes one badass old man.

"He can be summoned in Forbidden Woods and Byrgenwerth. However, he has a set of conditions that must first be met."Anyone care to state these conditions? They're no where on the page, and I wanna know what I did. Met Eileen, killed Henryk, Eileen survived the encounter and remained friendly. Summoned Henryk for the Shadows of Yharnam fight. I'm wearing the Impurity rune, and this is NG+.

I didn't speak with Eileen, and went back to central yharnam in order to get some blood vials.when I reached at the tomb of Oedon, Henryk appeared and started fighting me after couple of seconds Eileen showed up too.we managed to kill him so I got the rune and returned to hunters dream to purchase his attire, nothing was there. What's the problem?